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Kota samarinda,
Kalimantan timur
INDONESIA
JURNAL ATOMIK
Published by Universitas Mulawarman
ISSN : 25490052     EISSN : 25490052     DOI : -
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science
Jurnal Atomik (JA) is published twice a year (March and August) by Department of Chemistry, Faculty of Mathematics and Natural Sciences, Mulawarman University. Jurnal Atomik is a media for graduate students of Department of Chemistry to publish their research articles in Chemistry field including Analytical Chemistry, Inorganic Chemistry, Physical Chemistry, Organic Chemistry, and Biochemistry. The research articles that be submitted to Jurnal Atomik have to be approved by Editorial Board and in accordance with the rules of writing approved by Editor of Jurnal Atomik.
Arjuna Subject : -
Articles 194 Documents
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AKTIVITAS ANTI-Staphylococcal SECARA IN VITRO EKSTRAK DIKLOROMETANA DARI RIMPANG TEMU KUNCI (Boesenbergia rotunda) TERHADAP Staphylococcus aureus ATCC 25923 Matutu, Deni Ari; Hairani, Rita; Ruga, Ritbey
JURNAL ATOMIK Vol 10 No 1 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i1.1404

Abstract

The rhizome of temu kunci (Boesenbergia rotunda) is one of the plants used by the local people in Indonesia as a traditional medicine. This study aimed to identify the secondary metabolite compounds contained in the dichloromethane extract with phytochemical screening and investigate its antibacterial activity against test bacteria Staphylococcus aureus ATTC 25923 was carried out by agar diffusion method with modification where tetracycline as a positive control and ethanol as a negative control. The phytochemical screening showed the dichloromethane extract contains secondary metabolites such as alkaloids, flavonoids, phenolics and triterpenoids. With 1 mg/mL of dichloromethane extract revealed its antibacterial activity against S. aureus with inhibitory zone value of 15.0 ± 0.0 mm while its MIC value of the extract was 0.031 ± 0.0 mg/mL toward of tested bacteria. In addition, tetracycline as a positive control at 0.5 μg/mL exhibited its antibacterial potential with an inhibitory zone value of 22.0 ± 0.0 mm and its MIC value of 0.016 ± 0.577 µg/mL.
ADSORPSI ION LOGAM Pb2+ DENGAN ARANG AKTIF MAHKOTA NANAS (Ananas comosus (L.) Merr) TERMODIFIKASI KITOSAN Arsyakia, Tarisa; Koesnarpadi, Soerja; Lianasari, Ika Yekti
JURNAL ATOMIK Vol 10 No 1 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i1.1436

Abstract

Pineapple (Ananas comosus (L.) Merr) is one of the most widely produced plants in Indonesia. Pineapple crown can be classified as solid waste that has an impact on the environment. Another problem of environmental pollution is heavy metals such as lead. In this study, modification was carried out by adding chitosan to the activated charcoal prepared from pineapple crown powder waste. The purpose of this study was to determine the characterization of chitosan-modified pineapple crown activated charcoal using Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM), determine the optimum adsorption conditions based on variations in pH, contact time and concentration of Pb2+ metal and determine the percent absorption and adsorption capacity. The results of FT-IR characterization of pineapple crown charcoal, chitosan and chitosan-modified activated charcoal indicated the presence of O-H (streching), N-H, C-H (streching), C=C aromatic and C-H (bending) groups, and in pineapple crown charcoal and chitosan-modified pineapple crown activated charcoal also indicated C-O-C groups while chitosan indicated C-N groups. In the results of SEM characterization, pineapple crown charcoal has a smooth, chitosan has a rough and chitosan-modified activated charcoal has a slightly rough surface and is still tightly bound to each other. The optimum conditions for adsorption of chitosan-modified activated charcoal on Pb2+ metal ions at pH 4 with a contact time of 60 minutes and a concentration of 75 mg/L. The results of the adsorption capacity test at each pH variation, contact time and concentration of Pb2+ metal ions were 2.4154 mg/g, 14,89 mg/g and 15,1732 mg/g.
ELEKTRODEKOLORISASI LIMBAH CAIR INDUSTRI SARUNG TENUN SAMARINDA MENGGUNAKAN ELEKTRODA PbO2/Pb DARI AKI BEKAS Ramadani, Desi Fidyah; Wirawan, Teguh; Widodo, Nanang Tri
JURNAL ATOMIK Vol 10 No 1 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i1.1413

Abstract

Electrodecolorization of liquid waste from the Samarinda woven sarong industry using PbO2/Pb electrode has been conducted. The purpose of this study was to decolorize woven sarong wastewater samples using the electrodecolorization method using lead dioxide (PbO2) as the anode and lead (Pb) as the cathode. Electrodecolorization is carried out by varying working potential, Na2SO4 electrolyte concentration, time and electrode distance. The dye concentration was determined using a UV-Vis spectrophotometer. The research results showed that the optimum conditions for electrodecolorization of woven sarong wastewater samples were using PbO2/Pb electrodes, namely with a working potential of 6 volts, a Na2SO4 electrolyte concentration of 0.25 M, a time of 60 minutes, and a distance of 1 cm. The percentage of decolorization of Samarinda woven sarong wastewater samples using PbO2/Pb electrodes, at maximum conditions was 98,75%.
ADSORPSI ZAT WARNA DIREK HITAM MENGGUNAKAN ARANG AKTIF DARI MAHKOTA NANAS (Ananas comosus (L) Merr) TERMODIFIKASI KITOSAN Putri, Raisya Karina; Yusuf, Bohari; Widodo, Nanang Tri
JURNAL ATOMIK Vol 10 No 1 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i1.1433

Abstract

Consumption of pineapple fruit (Ananas comosus (L) Merr) results in solid waste of about 45-65%, especially the pineapple crown. On the other hand, the textile industry uses dyes such as recolors that can cause pollution in the aquatic environment. This study aims to use activated charcoal from chitosan-modified pineapple crown as an adsorbent for direct dyes. The steps taken are characterizing activated charcoal, chitosan and chitosan-modified activated charcoal using Fourier Transform Infrared (FT-IR) and Scanning Electron Microscopy (SEM), optimizing with variations in mass, contact time and pH, and determining the maximum adsorption capacity. Preparation of pineapple crown activated charcoal carbonated at 400oC for 1 hour. Activated using 2% NaOH and then modified with chitosan. The chitosan-modified pineapple crown activated charcoal was used to adsorb the dye direct black and analyzed using a UV-Vis spectrophotometer. The results of FT-IR characterization of pineapple crown activated charcoal, chitosan and chitosan-modified pineapple crown activated charcoal indicated the presence of O-H, C-H (stretching), C=O and C-H (bending) groups, and in chitosan and chitosan-modified activated charcoal also indicated the appearance of overlapping N-H (amine), C-N (amide) and C-O-C groups. The results of SEM characterization of pineapple crown activated charcoal show that the surface has a smooth texture, chitosan has a rough and irregular texture surface and chitosan-modified pineapple crown activated charcoal has small clumps of various sizes and shapes. The results of the optimum conditions of adsorption of chitosan-modified pineapple crown activated charcoal on black rec dye occurred at a mass of 0.25 grams, contact time for 20 minutes and pH 7 with a maximum adsorption capacity of 11,6472 mg/g following the Langmuir isotherm.

Page 20 of 20 | Total Record : 194

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